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Malta Railway No. 7 to 10

Malta 1895 4 produced
Locomotive Magazine, October 1927

Numbers 7 to 10 of the Malta Railway were the last and heaviest locomotives this small seven-mile line had received. The first one was built in 1895 by Beyer, Peacock & Co. after the two previous locomotives built by Manning, Wardle were found to have too much weight on the driving axles. It was based on a 2-6-4T delivered to the Minas and Rio Railway in Brazil, but did not have a cow catcher and a steam sander.

In comparison to locomotives 5 and 6, the new one could be distinguished by the inclined cylinders. It had more weight on the leading Bissel truck and some of the water was being carried next to the coal bunker to get additional weight away from the driving axles. In the result, the driving axles together only carried a weight of 19 tons and 16 cwt. The locomotive could still haul 150 tons with 25 mph on the level and had no problems with the 2 1/2 percent inclines on the line.

Since No. 7 fulfilled all expectations, three more locomotives were built in 1896, 1899 and 1905. The last one differed from the others in that it had cylinders with a diameter of only 18 instead of 20 inches to reduce costs. In World War I, they had to haul trains of up to twelve coaches. Later when they got new boilers, these were still saturated and identical to the original boilers. Their end came in 1931 when the railway had lost to buses and the line was closed.

Technical data

General

Built
1895-1905
Manufacturers
Beyer, Peacock & Co.
Wheel arrangement
2-6-4T (Adriatic)
Gauge
1,000 mm (Meter gauge)

Dimensions and weights

Wheelbase
7.06 m
Service mass
36.1 t
Adhesion mass
20.1 t
Rigid wheelbase
2.29 m
Water capacity
4,546 l
Fuel capacity
2 t (coal)

Boiler

Grate area
1.115 m²
Firebox surface
6.076 m²
Tube heating surface
59.021 m²
Evaporative heating surface
65.097 m²
Total heating surface
65.1 m²

Power plant

Driver diameter
994 mm
Boiler pressure
11 bar
Expansion type
simple expansion
Cylinders
two, 362 x 508 mm

Power

Power source
steam
Estimated power
168 kW (228 PS)
Starting effort
62.8 kN

Calculated values

Factor of adhesion
1 : 3.14
Optimal speed
16 km/h
Power-to-weight ratio
4.7 kW/t
Heating Surface Equivalent
95.5 m²
Cylinder volume/HSE
1 : 1,094.92
Adhesive weight/Total
1 : 1.80
Tractive force/Heating surface
1 : 20.15
Grate area/Heating surface
1 : 58.38
Firebox/Tube surface
1 : 9.71
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